Backport of job endpoint: fix implicit constraint mutation for task-level services into release/1.7.x

[hc-github-team-nomad-core]

Backport

This PR is auto-generated from #22229 to be assessed for backporting due to the inclusion of the label backport/1.7.x.

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The person who merged in the original PR is:
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The below text is copied from the body of the original PR.

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Fixes a regression in Nomad 1.7 which caused task-level services no longer having created implicit Consul constraints.

Resolves #22190

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Overview of commits

• f0851bc

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